Thermodynamics via creation from nothing: Limiting the cosmological constant landscape
Abstract
The creation of a quantum Universe is described by a density matrix which yields an ensemble of universes with the cosmological constant limited to a bounded range Λ_{min}≤Λ≤Λ_{max}. The domain Λ<Λ_{min} is ruled out by a cosmological bootstrap requirement (the selfconsistent back reaction of hot matter). The upper cutoff results from the quantum effects of vacuum energy and the conformal anomaly mediated by a special ghostavoidance renormalization. The cutoff Λ_{max} establishes a new quantum scale—the accumulation point of an infinite sequence of garlandtype instantons. The dependence of the cosmological constant range on particle phenomenology suggests a possible dynamical selection mechanism for the landscape of string vacua.
 Publication:

Physical Review D
 Pub Date:
 December 2006
 DOI:
 10.1103/PhysRevD.74.121502
 arXiv:
 arXiv:hepth/0611206
 Bibcode:
 2006PhRvD..74l1502B
 Keywords:

 04.60.Gw;
 04.62.+v;
 98.80.Bp;
 98.80.Qc;
 Covariant and sumoverhistories quantization;
 Quantum field theory in curved spacetime;
 Origin and formation of the Universe;
 Quantum cosmology;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology
 EPrint:
 RevTex, 4 pages, 4 figures